SANGJU, South Korea (AP) — In a country where bikes are either a poor man's transportation or a weekend workout for spandex-clad racers, the longest and most highly engineered network of car-free paths in the world is being built through dense evergreen forests, down wildflower-lined river valleys and over steep mountain crests. A South Korean schoolteacher has ridden his country's entire 2,700-kilometer (1,677-mile) of trails completed to date.Read more on NewsOK.com